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You could use the over flow to add water or cleaners manually. The overflow on our 2016 is near the rear bumper, I think its over the actual tank. It was a plastic cap of sorts and you can slide up just a bit and it comes off. Underneath that plastic cap ours has a spout about the size of a water hose, there is a strainer in it that pops out with your finger. I found this when I over filled the freshwater tank and then while gently messing with the plastic cover piece I found it slide up and off exposing the actual water outlet, I thought, wow, this would be an easy place to either fill the tank manually or to add stuff. I've not tried it but I don't see why it wouldn't work, I saw no signs of a back flow valve etc.
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